ES314092A1 - Improvements relating to microporous plastics sheet material - Google Patents
Improvements relating to microporous plastics sheet materialInfo
- Publication number
- ES314092A1 ES314092A1 ES0314092A ES314092A ES314092A1 ES 314092 A1 ES314092 A1 ES 314092A1 ES 0314092 A ES0314092 A ES 0314092A ES 314092 A ES314092 A ES 314092A ES 314092 A1 ES314092 A1 ES 314092A1
- Authority
- ES
- Spain
- Prior art keywords
- strip
- dough
- pore forming
- sheet
- solvent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/26—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
Abstract
A microporous plastics sheet is made by mixing together a plastics material, a solvent therefore, and a particulate pore forming material to produce a dough, forming the dough into a strip, heating the strip to such a temperature (the "Thermal Shock Temperature") that the particles of pore forming material are exposed within the strip and substantially all the solvent is driven off, immersing the strip in an aqueous bath to leach out the exposed pore forming particles, and finally drying the porous strip thus formed. The plastics material may be plasticized or unplasticized PVC, low or high density polythene, polypropylene or polyurethane, the "Thermal shock temperature" being not less than 130 DEG C., 150 DEG C., 130 DEG C., 150 DEG C., 170 DEG C. and 185 DEG C. respectively. The pore forming particles may be salts of alkali or alkaline earth metals or ammonium salts, e.g. sulphates, chlorides and bicarbonates. In one embodiment (see all Figures, not shown) ground ammonium sulphate is mixed with powdered PVC at a station (30) and the mixture introduced into a twin screw mixer (60) during the passage through which a solvent and a minute proportion of a melting agent is added through a feed pipe (113), the dough thus formed being subsequently de-aereated. The de-aereated dough is then fed either directly to an extrusion die or, as in the example, via a granulator 17 and storage hopper, to an extrusion die, whence it is formed into a ribbed sheet. The sheet is then passed through successively hotter regions in a hot air oven (see Fig. 3) and heated to the required temperature, after which it passes through a series of water baths each successive one being higher than the next (see Figs. 4 and 5) so that a counter current of water is produced. The now porous sheet is finally passed to a drying oven (160) having successively cooled zones, to form the finished strip. Material suitable for clothing, battery separators or filters may be made.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2457664A GB1107783A (en) | 1964-06-12 | 1964-06-12 | Improvements relating to microporous plastics sheet material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES314092A1 true ES314092A1 (en) | 1966-04-01 |
Family
ID=10213827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES0314092A Expired ES314092A1 (en) | 1964-06-12 | 1965-06-11 | Improvements relating to microporous plastics sheet material |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT274924B (en) |
| BE (1) | BE665309A (en) |
| DE (1) | DE1504732A1 (en) |
| ES (1) | ES314092A1 (en) |
| FR (1) | FR1448876A (en) |
| GB (1) | GB1107783A (en) |
| NL (1) | NL6507510A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10237870B4 (en) * | 2002-08-19 | 2013-06-27 | Dilo Trading Ag | Process for the production of battery electrodes and the use of these battery electrodes for the production of secondary lithium batteries and battery electrodes |
-
1964
- 1964-06-12 GB GB2457664A patent/GB1107783A/en not_active Expired
-
1965
- 1965-06-11 NL NL6507510A patent/NL6507510A/xx unknown
- 1965-06-11 FR FR20437A patent/FR1448876A/en not_active Expired
- 1965-06-11 ES ES0314092A patent/ES314092A1/en not_active Expired
- 1965-06-11 BE BE665309D patent/BE665309A/xx unknown
- 1965-06-11 DE DE1965P0037039 patent/DE1504732A1/en active Pending
- 1965-06-14 AT AT537465A patent/AT274924B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| BE665309A (en) | 1965-10-01 |
| AT274924B (en) | 1969-10-10 |
| DE1504732A1 (en) | 1969-10-09 |
| GB1107783A (en) | 1968-03-27 |
| NL6507510A (en) | 1965-12-13 |
| FR1448876A (en) | 1966-08-12 |
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